Carburetor system



March i938. E. BURRELL OSS CARBURETOR SYSTEM Filed Jan. 30, 1937 Patented Mar. 1, 1933 A UNITED. stares eA'rEnr orgies Y canonn'roa SYSTEM v Edward Burrell, Oakville, Ontario, Canada i Application Jamiary'so, 1937,'seria1 No. 123,173 v l Claims. (o1. 2614-15) The-.invention relates to carburetors for inter 'nal combustion engines, and more particularly to ay carburetor system incorporating means for' prelieating the air and the liquid fuel. l

f The salient object of the inventionis to produce a carburetor structure whereby a more eili- `cient `mixture is obtained,'resulting in a substantial saving of fuel in the operation of an internal combustion engine. lt has beenascertained that a decided increase in mileage fora given quantity of gasoline is obtainable from an automobile equipped with the present invention over oneemploying a conventionalcarburetor. t f The inventioncomprehencisthe p-reheating of airpreferably by means of circulatingitabout a hot zone of the exhaust of, therengine, andthe preheating of. theliquid fuel, preferablyY by cir,-`

culating'it about a zone of the exhaust having a v more .moderate degree of heat, whereby heating Qithejfuel ensues without appreciable vaporizatifonglThe` heated air and .fuel are introduced into a `mixing chamber and drawn through car-V bureting baiiies or screensto eiect complete Yvaporization" and commingling of the air and fuel v to compose a highly eicient charge..

An outstanding featureV of the present invention is that the gasoline supply tank is usedas the mixingchamber. Y ordinary carburetor on :the engine. It is not essential however thatrsuch tank be employed in this capacity since a separate Vchamber might conceivably be used without departing from the spirit and scope ofthe invention. MI-Iaving described the main objects of the invention,v subsidiary objects and advantages will be evident as) they invention' is Yrecounted in greater detail.V .E t- Y Referring tothe accompanying drawing, 40 Figure l is a plan View of the invention.

Figure 2 isa sideVV elevation thereof. v Figure 3 is a vertical sectonof the mixing chamber taken on line 3-3 of Figure l.v

Figure 4 is a cross section thereof taken on line 4--4 of Figure 3.

Figure 5 is a cross section of the air heating chamber taken on line 5--5 of Figure 2.

Figure 6 is a longitudinal sectional detail of a check valve employed in the airand fuel lines. Like numerals of reference indicate corresponding parts in each figure of the drawing.

The drawing is illustrative of the preferred construction of the invention and depicts'a main gasoline supply tank IS that usually extends crosswise of the rear oi a motor'car` The tank This dispenses with the VfuelV so as to have a Ybody thereof as atV l and a vapor space M'thereover. Conventional means may be employed to regulate the amount of fuel 15 admitted `through the ll cap sc thatthe level will not rise beyond a predetermined point in filling thetank. VA ball-cock would serve this purpose. "I t' Atlone endz of .the tank an Yair line I5 com- 20 Ilunioates with the',` interior andrleads oi to a p-reheating chamber i6. The conduit l5 may and willbe valve controlled las at Il and supplied with a check valve'iS, which, as detailed in Figure 6, may consist of a ball 20 urged against a 25 seat by, a spring 2l.`

The .air preheating chamber preferably comprises a member contiguously mounted on a hot Zoneof the exhaust pipe il, which naturally Will be aportion'in the vicinity of the engine. Said 30 member is shown as of a cylindrical shape having anair inlet nipple 22 diametrically opposed to the outlet 23. i `It is suggested that diametrically disposed jbaiiies 2d be arranged in the member so as to terminate short `of vthe end 25 in order 35 that air beA caused to travel in Ya circuitous passage before leaving the heating chamber.

A gasoline line 25 is branched oi the air line at a point adjoining the tank )and conducted downwardly to a fluidfheating chamber 2l en- 40 circling the cooler zone of the exhaust pipe near its discharge terminus 28. The Vline 25 is valveV controlled at 29 and may or may not be equipped with a check valve, indicated at 3B, for the pur pose of regulating and precluding back flow. 45 If such a valve is used, it must necessarily'be an exceedingly sensitive one in order not to present any appreciable resistance. In actual practice,

a ball-check valve has been employed Without spring pressure. 50

The fluid heating chamber forms a receptacle contiguously mounted on the exhaust pipe for the purpose of containing a comparatively small quantity of fuel fed to it by gravity 'flow from the tank i0 by means of the conduit 3i. 55

The end 32 of the tank opposite the feed lines I5 and 26 has an outlet in the vapor space from which a conduit 33 leads off to the intake manifold of the engine (not shown).

It Will be manifest that, according to the preceding system, the operation of the engine will heat air in the chamber l'6 and gasoline in the chamber 21, and that due to engine suction these fluids will be drawn into the tank and there mixed and lthoroughly carbureted by passage through the screens or baflles; additional vapor is picked up in the tank from the fluid body therein.

It Will be observed that an important feature resides in locating the fluid heating chamber at a zone of moderate heat with respect to the exhaust pipe whereby the fluid is heated or partially vaporized, the supply being taken from the main body in the tank and re-admitted thereto in a more volatile condition. which together with the heated air completes the carburetion in the tank.

It will be gathered that While reduction of pressure due to engine suction is equal on the pipe 26 and the pipe 3l the iiuid in the pipe 26 is` heated by its passage through the heating chamber 21 and therefore its specific gravity or density is reduced. Due `to expansion and the vaporized condition of the fuel 4in the small bore of the pipe 26, the resultant differential is sumcient to enable the fuel to be entrained in the heated air stream by reason of the Y-connection of the pipes I5 and 26. Accordingly, both heated air and fuel are admitted to the tank under engine suction.

What I claim iszl. In a carbureting system of the class described, a mixing chamber adapted to contain a main body of liquid fuel with a vapor space thereover, carbureting means therein, an air inlet in advance thereof in communication with the vapor space aforementioned, a heating chamber, means forming a delivery passage between the mixing chamber and the heating chamber below the level of the liquid fuel in the mixing chamber, means forming a return communication between the heating chamber and the vapor space of the mixing chamber in advance of the carbureting means, and a suction outlet communicating with the vapor space of the mixing chamber rearwardly of the carbureting means.

2. In a carbureting system of the class described, a mixing chamber adapted to contain a main body of liquid fuel with a vapor space thereover, meansl for heating air exteriorly thereof and conducting it to the vapor space thereof, an external heating chamber, conduit means therefor such as to deliver liquid fuel from the mixing chamber and return it thereto concurrently With the ingress of the heated air, and a suction outlet in the vapor space of the mixing chamber and so located as to cause the heated air and fuel to traverse the main body of liquid fuel aforesaid.

3. The combination in a carbureting system of the class described, of a mixing chamber adapted to contain a main body of liquid fuel with a vapor space thereover, a hot-air heating chamber heated by `the exhaust passage, an inlet therefor, a conduit leading from the hot air chamber to the vapor space of the mixing chamber, a second heating chamber, conduit means therefor such as to deliver liquid fuel from the mixing chamber and return it thereto concurrently with the ingress of heated air, and a suction outlet in the vapor space of the mixing chamber and so located as to cause heated air and fuel to traverse the main body of fuel aforesaid.

4. The combination in a carbureting system of the class described, of an internally heated pipe, a mixing chamber disposed above the pipe and adapted to contain a main body of liquid fuel with a vapor space thereover, a hot air chamber encircling the pipe, an inlet therefor, a conduit leading from the hot air chamber to the mixing chamber and communicating with the vapor space thereof, a fuel heating chamber contiguously encircling the pipe, a conduit extending from the bottom of the mixing chamber to the fuel heating chamber, a conduit extending from the fuel heating chamber and communicating with the conduit of the hot air chamber in juxtaposition to its entrance to the mixing chamber, and a suction outlet extending from the mixing chamber and communicating with the vapor space thereof oppositely to the conduit of the hot air chamber.

5. The combination in a carbureting system of the class described, of an internally heated pipe substantially horizontally arranged, a mixing chamber disposed above the heated pipe and adapted to contain a main body of liquid fuel with a vapor space thereover, a series of carbureting screens transversely arranged in the mixing chamber and depending from the top thereof and disposed to have their bottom portions immersed in fuel therein, a hot air cham ber encircling the heated pipe, an inlet therefor, a conduit leading from the hot air chamber to the mixing chamber and communicating with the vapor space thereof, a fuel heating chamber contiguously encircling the heated pipe, a conduit extending from the bottom of the mixing chamber to the fuel heating chamber, a conduit extending from the fuel heating chamber and communicating with the conduit of the hot air chamber in juxtaposition to its entrance to the mixing chamber, and a suction outlet extending from the mixing chamber and communicating With the vapor space thereof oppositely to the conduit of the hot air chamber.

EDWARD BURR/ELL. 

